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CVE-2024-35801 is a Linux kernel x86 FPU-state handling flaw caused by divergence between the per-CPU xfd_state cache and the hardware MSR_IA32_XFD register. CPU hotplug resets MSR_IA32_XFD to the initial FPU-state value, but did not reset the cached per-CPU xfd_state value. A subsequent xfd_update_state() can therefore incorrectly determine that no MSR write is necessary. This leaves the hardware XFD state stale; a later XRSTOR operation can raise a kernel-mode device-not-available (#NM) exception and crash the kernel. The upstream correction introduces xfd_set_state() to update the cache and MSR together and applies it wherever MSR_IA32_XFD is set.
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Linux kernel x86 FPU state synchronization issue involving xfd_state and MSR_IA32_XFD.
Linux kernel x86 FPU state-management flaw in which xfd_state can fall out of synchronization with the MSR_IA32_XFD register.
A CVE included in the advisory's CVE list; no vulnerability details are provided in the content.
A vulnerability addressed by this OpenShift Container Platform 4.18.5 security update; no technical details are provided in the content.
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